The secrets of Cryptography
summary
Historic ciphers (Caesar, substitution, Vigenère, Enigma) motivate modern choices and attacks: demonstration that substitution falls to frequency analysis despite 403,291,461,126,605,635,584 keys, Enigma breaks exploit operational errors, comparison of stream ciphers (RC4, A5/1) and block ciphers with AES modes (ECB, CBC, CTR, authenticated CTR/GCM), RSA key‑wrapping and signatures with SHA‑256, and practical PHP advice to use RSA/libsodium or defuse/php‑encryption rather than rolling your own.
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chapters (9)
- 0:00Start
- 6:29recover the original plaintext
- 10:45start looking for repeated sequences of letters in the ciphertext
- 21:29combine the hash with a secret key of some form
- 21:53using a public key cryptography system
- 33:53output a block of ciphertext
- 47:34introduce vulnerabilities into applications through things like side channels
- 48:00use an existing implementation
- 49:19audit your code
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